//返回顶部
#floater{
    width: 60px;
    height: 270px;
    color: #fff;
    font-size: 12px;
    background-color: rgba(0,0,0,0.5);
    border-radius: 60px;
    text-align: center;
    position: fixed;
    right: 50px;
    bottom: 60px;
    z-index: 999;
}
#floater div{
    width: 48px;
    height: 70px;
    margin: 0 auto;
    padding-top: 20px;
    cursor: pointer;
    span{
        font-size: 40px;
    }
}
#floater a{
    width: 48px;
    height: 70px;
    display: block;
    margin: 0 auto;
    color: #fff;
    margin: 0 auto;
    padding-top: 20px;
    span{
        font-size: 40px;
        padding-top: 10px;
    }
}
#floater a:nth-child(2){
    border-top: 1px solid #fff;
    border-bottom: 1px solid #fff;
}